This paper examines the origin, range and meaning of the Principle of Action and Reaction in Kant’s mechanics. On the received view, it is a version of Newton’s Third Law. I argue that Kant meant his principle as foundation for a Leibnizian mechanics. To find a ‘Newtonian’ law of action and reaction, we must look to Kant’s ‘dynamics,’ or theory of matter. I begin, in part I, by noting marked differences between Newton’s and Kant’s laws of action and reaction. I (...) argue that these are explainable by Kant’s allegiance to a Leibnizian mechanics. I show (in part II) that Leibniz too had a model of action and reaction, at odds with Newton’s. Then I reconstruct how Jakob Hermann and Christian Wolff received Leibniz’s model. I present (in Part III) Kant’s early law of action and reaction for mechanics. I show that he devised it so as to solve extant problems in the Hermann-Wolff account. I reconstruct Kant’s views on ‘mechanical’ action and reaction in the 1780s, and highlight strong continuities with his earlier, pre-Critical stance. I use these continuities, and Kant’s earlier engagement with post-Leibnizians, to explain the un-Newtonian features of his law of action and reaction. (shrink)

In this thesis I provide an interpretation of Kant's theories of knowledge, nature, and being in order to argue that Kant's ontology is a productive ontology: it is a theory of being that includes a notion of production. I aim to show that Kant's epistemology and philosophy of nature are based on a theory of being as productivity. The thesis contributes to knowledge in that it considers in detail Kant's ontology and theory of being, topics which have generally been ignored (...) or misunderstood. In arguing for Kant's productive ontology, I argue against Heidegger's interpretation of Kant, which states that Kant understands being as "produced permanent presence" or as divinely created materiality. Based on Kant's definition of being as positing, I argue, by contrast to Heidegger, that Kant understands being as the original productive relation between subject and object. This can also be expressed as the relation between formality and materiality, or between epistemic conditions and existence, that is productive of objects of experience. Being is not producedness but a relation of productivity, through which both subject and object are themselves productive. The subject is productive in its spontaneity, and nature, determined as dynamical interaction, is interpreted as productive. The subject, I will argue, does not understand nature as produced, but approaches it with a comportment towards its production as object of experience. Because of its own subjective productivity - spontaneity or "life" - the subject has a "productive comportment" towards nature. Ontology, I claim, concerns the realm of the productive relation of being, the realm of the relation between epistemic conditions and existence, and therefore the realm of possible experience. This marks Kant as divergent not only from what Heidegger calls "the ontology of the extant", but also from the concept-based ontology of the German rationalists. The general aims of the thesis are, first, to argue that being for Kant is the original relation between subject and object, and that ontology concerns this relation; second, to argue that ontology and being are understood in terms of production and productivity; and third, to argue that Heidegger is wrong to ascribe to Kant an understanding of being as "produced pennanent presence". I approach these aims by examining a number of Kant's texts in detail, focusing particularly on Kant's theses about existence and being in The One Possible Basis for a Demonstration of the Existence of God and the Critique of Pure Reason; on Kant's philosophy of nature and dynamical matter in the Transcendental Analytic and Metaphysical Foundations of Natural Science; on Kant's doctrine of experience and objectivity in the Transcendental Deductions; on ontological reflection and the productive comportment of "life" in the Critique of Judgment; and on Kant's final theory of matter, life and production in the Opus Postumum. (shrink)

Pragmatism has ties to Idealism; it has even been accused of being a form of idealism. I tell a story about the changing nature of idealism that makes sense of its relationship to pragmatism without threatening to collapse the two. My story is a genealogy that begins well before pragmatism shows up. Pragmatism has very little in common with the subjective idealism of Berkeley or the problematic idealism of Descartes; the differences between idealism and pragmatism get blurred only because idealism (...) underwent an evolution transforming it into something primed to influence and maybe bleed into pragmatism. It was, according to my story, the evolved idealism developed in Germany between 1781 and 1831 that contributed to the formation and development of pragmatism. Yet pragmatism is a large evolutionary step away from idealism, however much it retains and utilizes some of the strengths of late idealistic thought. (shrink)

Since his Metaphysische Anfangsgründe der Naturwissenschaft was first published in 1786, controversy has surrounded Immanuel Kant’s conception of matter. In particular, the justification for both his dynamical theory of matter and the related dismissal of mechanical philosophy are obscure. In this paper, I address these longstanding issues and establish that Kant’s dynamism rests upon Leibnizian, metaphysical commitments held by Kant from his early pre-Critical texts on natural philosophy to his major critical works. I demonstrate that, throughout his corpus and inspired (...) by Leibniz, Kant endorses the a priori law of continuity of alteration as a truth of metaphysics, according to which all alterations in experience must occur gradually through all intervening degrees. The principle thus legislates against mechanical philosophy’s absolutely impenetrable atoms, as they would would involve instantaneous changes of velocity in impact. This reveals the metaphysical incoherencies in mechanical philosophy and leaves Kant’s own dynamical theory of matter, grounded on material forces, as the only viable approach to physical explanation. Subsequently, I demonstrate that Kant nevertheless made conceptual space in his system for the theoretical consideration of mechanical explanations, which makes manifest one of the positive roles that the faculty of reason can play with respect to natural science. (shrink)

It is well known that Kant claims that causal judgments, including judgments about forces, must have an a priori basis. It is less well known that Kant claims that we can perceive the repulsive force of bodies through the sense of touch. Together, these claims present an interpretive puzzle, since they appear to commit Kant to both affirming and denying that we can have perceptions of force. My first aim is to show that both sides of the puzzle have deep (...) roots in Kant's philosophy. My second aim is to present three potential solutions to the puzzle and show that each faces problems. (shrink)

This paper examines how in the ‘Critique of teleological judgment’ Kant characterized the concept of natural purpose in relation to and in distinction from the concepts of nature and the concept of purpose he had developed in his other critical writings. Kant maintained that neither the principles of mechanical science nor the pure concepts of the understanding through which we determine experience in general provide adequate conceptualizations of the unique capacities of organisms. He also held that although the concept of (...) natural purpose was derived through reflection upon an analogy to human purposive activity in artistic production and moral action, it articulates a unique notion of intrinsic purposiveness. Kant restricted his critical reflections on organisms to phenomena that can be given to us in experience, criticizing speculations on their first origins or final purpose. But I argue that he held that the concept of natural purpose is a product of the reflecting power of judgment, rather than an empirical concept, and represents only the relation of things to our power of judgment. Yet it is necessary for the identification of organisms as organized and self-organizing, and as subject to unique norms and causal relations between parts and whole. (shrink)